Colin Firth‘s friends are whipping up support for his Oscar campaign for “The King’s Speech.” Christine Baranski, Ellen Burstyn, Patricia Clarkson and Julianne Moore, who’ve all worked with him, hosted “The Girls’ Night Out” screening Sunday night at the Tribeca Grand. In the movie, opening Friday and already generating Oscar buzz, Firth plays Britain’s King George VI, who struggled with a crippling speech impediment. A source said, “This was about people who have been around Colin’s career for some time who wanted to show him support.” But he said in his usual modest fashion, “To be friends with one of these women could be considered fortunate, to be friends with all of them is almost embarrassing.” Guests included Katie Couric, Christiane Amanpour, Elizabeth Banks, Henry Kravis and wife Marie-Josée, Tamara Mellon, Nat Rothschild, Meg Ryan, Julian Schnabel, Steve Schwarzman with wife Christine, Russell Simmons and Debra Winger.